1 /*
2  * Copyright (C) 2010 Google Inc. All Rights Reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  *
25  */
26 
27 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_EVENTS_EVENT_QUEUE_H_
28 #define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_EVENTS_EVENT_QUEUE_H_
29 
30 #include "third_party/blink/public/platform/task_type.h"
31 #include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
32 #include "third_party/blink/renderer/platform/wtf/linked_hash_set.h"
33 
34 namespace blink {
35 
36 class Event;
37 class ExecutionContext;
38 
39 class CORE_EXPORT EventQueue final : public GarbageCollected<EventQueue>,
40                                      public ExecutionContextLifecycleObserver {
41   USING_GARBAGE_COLLECTED_MIXIN(EventQueue);
42 
43  public:
44   EventQueue(ExecutionContext*, TaskType);
45   ~EventQueue();
46 
47   void Trace(Visitor*) override;
48   bool EnqueueEvent(const base::Location&, Event&);
49   void CancelAllEvents();
50   bool HasPendingEvents() const;
51 
52  private:
53   bool RemoveEvent(Event&);
54   void DispatchEvent(Event*);
55 
56   void ContextDestroyed() override;
57   void Close(ExecutionContext*);
58   void DoCancelAllEvents(ExecutionContext*);
59 
60   const TaskType task_type_;
61   HeapLinkedHashSet<Member<Event>> queued_events_;
62   bool is_closed_;
63 };
64 
65 }  // namespace blink
66 
67 #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_EVENTS_EVENT_QUEUE_H_
68